Abstract:
ppml_panel_sg is a "fast" Poisson Pseudo-maximum Likelihood estimation command for use with international data and other types of spatial flows. It is specifically designed to alleviate the computational burden of the many fixed effects required by structural gravity models, particularly the many "pair" fixed effects that are required in order to consistently estimate the effects of trade policies in panel settings. Key features include a check to verify the existence of estimates, the allowance for pair-specific time trends, and the ability to store fixed effects post-estimation for use in structural work.